I've never heard of any conversion transmitters,zero,single,dual or what ever!!!! just keep matched up on the usual factors such as frequency , AM , FM , PM, and Positive or Negative shift,,,once a receiver syncs up on its matching type signal , it does not care how it received it as the xmtr is putting out a clean signal only on that one frequency. Receivers are a different deal , with Dual Conversion types rejecting and ignoring all Other frequencys and not showing interference effects as much as Single conversion receivers types.

Gentlemen; Dual and single conversion apply only to receivers. There is no such thing as a dual conversion transmitter. Please read the FAQ section of the fmadirect web site regarding receivers to see what single and dual conversion receivers are about. Briefly, dual conversion receivers have two mixers and two Intermediate frequency sections while single conversion receivers have only a single IF at 455 KHz removed from the transmit freq. Dual conversion is used to avoid potential problems with signals at the image frequency. In the case of single conversion, the image frequency is just 900 KHz away from the transmit frequency and very difficult to filter in the front end, The image frequency in a receiver with a first IF 10.7 MHz from transmit frequency is heavily filtered and seldom ever a problem.